Chester l



UNITED sTATEs PATENT oEEroE.

CHESTER L. JOHNSON, OF LITTLE FALLS, NEW YORK, ASSIGNOR TO ALLEN M.GOLVER;

ROTARY PUMP.

Specicaton of Letters Patent No. 32,029, dated April 9, 1861.

To all whom it may concern:

Be it known that I, CHESTER L. JOHNSON, of Little Falls, county ofHerkimer, and Stateof. New York, have invented certain new and usefulImprovements in Rotary Pumps; and I hereby declare the following to be afull, clear, and exact description of the construction and operation ofthe same, reference beingI had to the accompanying drawings, making apart of this specication, and to the letters of reference markedthereon. j

The nature of my said invention consists in peculiar shaped pistons orwings combined with a cylinder eccentric to, but within the pump case,in such a manner that the said pistons passing through slots inthe innercylinder are tight within said slots but do not `bind therein whetherthe said pistons in their movement are on the radial lines of the saidinner cylinder or oblique thereto in consequence of the eccentric actionof said inner cylinder.

To enable others or those skilled in making' pumpsto construct and usemy invention I will now proceed to describe its construction andoperation.

Figure l of the drawings is a top plan or top view. Fig. 2 is' atransverse. sectional elevation cut through the periphery of the chestto show the arrangement of the hub valves and cylinder. Fig. 8 is anedge view of the periphery of the cylinder to show the form anddirection of the slots. Fig. 4 is an end view of the valves and itscollar, and Fig. 5 is a side view of the saine.

The same kind of letters indicate the same parts in all the gures. j

A, is the pump chest, or boX, and is constructed in a cylindrical form.

B, B, are arms or supports projecting from the chest through which it isbolted to the platform or frame work on which it is to be operated.

O, is the driving' shaft, having on it the crank D by which it is to berevolved. The shaft may also however be driven by a belt and pulley, orgear work as circumstances and its varied uses may require.

E, is the.induction or receiving tube, or pipe through which the air, orwater chamber K, is supplied. t

F, is the eduction, or exit tube, or pipe through which the air or wateris ejected or discharged.

G, .is a stationary hub, or standard erected exactly over the center ofthe inside of one head of the chest. It is large in diameter to admit ahole through on one side of its center for the shaft that carries thecylinder to work in, and is long enough to reach to the head of thecylinder.

H, H, are the valves or fans with collars or rings embodied therewith,and placed over the hub G, which is their center of motion. They fitclosely to the heads and periphery of the chest so that by everyrevolution they make around the hub, they sweep and clear the chamber K.The sidesof the valves, or fans, are slightly curved so as to make theout ends and the ends, or parts where they join or connect with thecollars thicker.

I, is a hollow cylinder open at one end however, but with a strong headat the other through the center of which the shaft C is inserted andfastened. On the inside of this head is a short hub or rim embodiedaround the hole that the shaft goes through to make a deeper bearing, sothat 'it may be more strongly and permanently fastened to the shaft. Therim or periphery of the cylinder is deeper or wider than necessary totill the space between the heads of the chest and one head has a groovein it for the open end of the cylinder to turn in. This is so made toleave a rim or projection outside of the slots J, J, to support the rimand make guides or bearing places for the valves to wear against;although it may answer' perhaps just as well to leave this projection orlarger width off, and let the valves bear against the head.

J, J, are the slots through the periphery of the cylinder by which thevalves are carried around the hub. They are made the thickness ofthehead beneath the end embodied therewith which makes the head of thechest requirea recess in it to go over this thickness of the, head ofthe cylinder so that the other part of the head may fit as closely tothe valves as practicable for them to work. It will be seen from thedrawing Fig. 2 that the periphery of the cylinder is placed in closeproximity to the interior periphery of the chest, thereby forming apartition between4 the induction and eductionr tubes E, and F andforming also the new moon shaped air and'water chamber K. There are noeccentric parts in this pump nor are there any eccentric movements. The

valves act around a common center, which keeps the out ends or fans in aconstant radial position with the periphery and center of the chest. Butthe cyinder turning on another center and carrying in its sots thevalves which turn on a different center, produces a vibration of thevalves in the slots which also produces an irregularity that has to bemet or remedied by valves with thicker ends and curved sides as shown atH, H, Fig. 4.

It will be seen by rotating the cylinder that the valves will be carriedover the mouths of the tubes E, and F, and thereby perform the oice of acut off. When a valve passes over the mouth of the tube E, in thedirection of the arrow (which is the proper `way to drive it,) the airor water will be carried past said tube, and be discharged through thetube F. By this operation a vacuum will be produced behind the valvewhich will be supplied immediately from without through the tube E,which will again be swept past and discharged, and so on alternately bythe two valves. It may be necessary and especially after the holesthrough the heads in which the shaft turns become worn, that packingboxes should be attached to the heads over these holes to prevent theingress of air or water into or out of the chest.

This pump will act as a suction or exhaust pump to raise water out ofwells, or out of the holds of vessels &c. It will also act as a forcepump for the purpose of irrigating gardens extinguishing fires and formany other uses unnecessary to mention here.

This I believe fully describes the construction and mode of using thispump.

I do not claim a rotary pump having a series of pistons or wings passingthrough slots in a cylinder revolving within and eccentric to the maincylinder; but I do not know of any previous instance in which thepistons or wings have been made with curved sides thinner in the middlein order that said pistons may set tightly in the slots through thecylinder and not bind therein when at an angle to the radius of saidcylinder, for in passing around, the pistons when fully projected orretracted are on the line of the radius of the cylinder I, but at theintermediate parts said pistons stand more or less angularly to saidradius hence said pistons are made thinner in the center as representedto prevent jamming or binding when partially crosswise of said openings.

What I claim and desire to secure by Letters Patent is- The pistons H,H, passing through the cylinder I, and revolving around a center (Gr) inthe manner specified when said pistons H, H, are formed thinner in themiddle and with the curved sides for the purposes and as specified.

CHESTER L. JOHNSON. [1.. s] Witnesses:

WM. HINDs, MoR'riMER C. HEATH.

